[c#源码分享]TCP通信中的大文件传送_.NET_编程开发_程序员俱乐部

源码   （为节省空间，不包含通信框架源码，通信框架源码请另行下载）

文件传送在TCP通信中是经常用到的，本文针对文件传送进行探讨

经过测试，可以发送比较大的文件，比如1个G或者2个G

本文只对文件传送做了简单的探讨，示例程序可能也不是很成熟，希望本文起到抛砖引玉的作用，有兴趣的朋友帮忙补充完善

首先看一下实现的效果

服务器端：

客户端（一次只能发送一个文件)：

服务器端收到的文件，存放到了D盘根目录下（存放的路径可以根据情况修改)

本程序基于开源的networkcomms2.3.1通信框架

下面来看一下实现的步骤：

1、客户端

   （1）： 先连接服务器：   

    //给连接信息对象赋值
            connInfo = new ConnectionInfo(txtIP.Text, int.Parse(txtPort.Text));

            //如果不成功，会弹出异常信息
            newTcpConnection = TCPConnection.GetConnection(connInfo);

            TCPConnection.StartListening(connInfo.LocalEndPoint);

            button1.Enabled = false;
            button1.Text = "连接成功";

（2）发送大文件（分段发送)     

   private void SendFileButton_Click(object sender, EventArgs e)
        {
            //打开对话框，获取文件
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                //暂时禁用发送按钮
                sendFileButton.Enabled = false;

                //获取对话框中选择的文件的名称
                string filename = openFileDialog1.FileName;

                //设置进度条显示为0
                UpdateSendProgress(0);

                try
                {
                    //创建一个文件流
                    FileStream stream = new FileStream(filename, FileMode.Open, FileAccess.Read);

                    //创建一个线程安全流
                    ThreadSafeStream safeStream = new ThreadSafeStream(stream);

                    //获取不包含路径的文件名称
                    string shortFileName = System.IO.Path.GetFileName(filename);

                    //每次发送的字节数 可根据实际情况进行设定
                    long sendChunkSizeBytes = 40960;
                    //已发送的字节数
                    long totalBytesSent = 0;
                    do
                    {
                        //检查剩余的字节数 小于 上面指定的字节数  则发送"剩余的字节数"  否则发送"指定的字节数"
                        long bytesToSend = (totalBytesSent + sendChunkSizeBytes < stream.Length ? sendChunkSizeBytes : stream.Length - totalBytesSent);


                        //包装一个ThreadSafeStream 使之可以分段发送
                        StreamSendWrapper streamWrapper = new StreamSendWrapper(safeStream, totalBytesSent, bytesToSend);

                        //顺序号 
                        long packetSequenceNumber;
                        //发送指定数据
                        newTcpConnection.SendObject("PartialFileData", streamWrapper, customOptions, out packetSequenceNumber);
                        //发送指定的数据相关的信息
                        newTcpConnection.SendObject("PartialFileDataInfo", new SendInfo(shortFileName, stream.Length, totalBytesSent, packetSequenceNumber), customOptions);

                        totalBytesSent += bytesToSend;


                        UpdateSendProgress((double)totalBytesSent / stream.Length);
                        //两次发送之间间隔一定时间
                        System.Threading.Thread.Sleep(30);


                    } while (totalBytesSent < stream.Length);



                }
                catch (CommunicationException)
                {

                }
                catch (Exception ex)
                {

                    NetworkComms.LogError(ex, "SendFileError");

                }

            }
           
        }

2：服务器端接收文件：

 （1）开始监听

   

 //服务器开始监听客户端的请求 
            //开始监听某T端口
            IPEndPoint thePoint = new IPEndPoint(IPAddress.Parse(txtIP.Text), int.Parse(txtPort.Text));   
            TCPConnection.StartListening(thePoint, false);
            button1.Text = "监听中";
            button1.Enabled = false;

            //此方法中包含服务器具体的处理方法。
            StartListening();

（2）添加接收文件处理方法

               //处理收到的文件字节数据
            NetworkComms.AppendGlobalIncomingPacketHandler<byte[]>("PartialFileData", IncomingPartialFileData);
           //处理收到的文件信息数据
            NetworkComms.AppendGlobalIncomingPacketHandler<SendInfo>("PartialFileDataInfo", IncomingPartialFileDataInfo);

  //处理收到的文件字节数据
       
        private void IncomingPartialFileData(PacketHeader header, Connection connection, byte[] data)
        {
            try
            {
                SendInfo info = null;
                ReceivedFile file = null;

                
                lock (syncRoot)
                {
                     //获取顺序号
                    long sequenceNumber = header.GetOption(PacketHeaderLongItems.PacketSequenceNumber);

                    if (incomingDataInfoCache.ContainsKey(connection.ConnectionInfo) && incomingDataInfoCache[connection.ConnectionInfo].ContainsKey(sequenceNumber))
                    {
                       
                        //如果已经收到此部分 “文件字节数据” 对应的 “文件信息数据”
                        info = incomingDataInfoCache[connection.ConnectionInfo][sequenceNumber];
                        incomingDataInfoCache[connection.ConnectionInfo].Remove(sequenceNumber);
 
                        if (!receivedFilesDict.ContainsKey(connection.ConnectionInfo))
                            receivedFilesDict.Add(connection.ConnectionInfo, new Dictionary<string, ReceivedFile>());

                        //如果当前收到字节数据，还没有对应的ReceivedFile类，则创建一个
                        if (!receivedFilesDict[connection.ConnectionInfo].ContainsKey(info.Filename))
                        {
                            receivedFilesDict[connection.ConnectionInfo].Add(info.Filename, new ReceivedFile(info.Filename, connection.ConnectionInfo, info.TotalBytes));
                           
                        }

                        file = receivedFilesDict[connection.ConnectionInfo][info.Filename];
                    }
                    else
                    {
                        
                        if (!incomingDataCache.ContainsKey(connection.ConnectionInfo))
                            incomingDataCache.Add(connection.ConnectionInfo, new Dictionary<long, byte[]>());

                        incomingDataCache[connection.ConnectionInfo].Add(sequenceNumber, data);
                    }
                }

                
                if (info != null && file != null && !file.IsCompleted)
                {
                    file.AddData(info.BytesStart, 0, data.Length, data);

                    
                    file = null;
                    data = null;
                    
                }
                else if (info == null ^ file == null)
                    throw new Exception("Either both are null or both are set. Info is " + (info == null ? "null." : "set.") + " File is " + (file == null ? "null." : "set.") + " File is " + (file.IsCompleted ? "completed." : "not completed."));
            }
            catch (Exception ex)
            {
              
                NetworkComms.LogError(ex, "IncomingPartialFileDataError");
            }
        }

   //处理收到的文件信息数据
        private void IncomingPartialFileDataInfo(PacketHeader header, Connection connection, SendInfo info)
        {
            try
            {
                byte[] data = null;
                ReceivedFile file = null;

                
                lock (syncRoot)
                {
                   //获取顺序号
                    long sequenceNumber = info.PacketSequenceNumber;

                    if (incomingDataCache.ContainsKey(connection.ConnectionInfo) && incomingDataCache[connection.ConnectionInfo].ContainsKey(sequenceNumber))
                    {
                        //如果当前文件信息类对应的文件字节部分已经存在
                        data = incomingDataCache[connection.ConnectionInfo][sequenceNumber];
                        incomingDataCache[connection.ConnectionInfo].Remove(sequenceNumber);

                        
                        if (!receivedFilesDict.ContainsKey(connection.ConnectionInfo))
                            receivedFilesDict.Add(connection.ConnectionInfo, new Dictionary<string, ReceivedFile>());

                       
                        if (!receivedFilesDict[connection.ConnectionInfo].ContainsKey(info.Filename))
                        {
                            receivedFilesDict[connection.ConnectionInfo].Add(info.Filename, new ReceivedFile(info.Filename, connection.ConnectionInfo, info.TotalBytes));
                            
                        }

                        file = receivedFilesDict[connection.ConnectionInfo][info.Filename];
                    }
                    else
                    {
                        
                        if (!incomingDataInfoCache.ContainsKey(connection.ConnectionInfo))
                            incomingDataInfoCache.Add(connection.ConnectionInfo, new Dictionary<long, SendInfo>());

                        incomingDataInfoCache[connection.ConnectionInfo].Add(sequenceNumber, info);
                    }
                }

               
                if (data != null && file != null && !file.IsCompleted)
                {
                    file.AddData(info.BytesStart, 0, data.Length, data); 
                    file = null;
                    data = null;
                  
                }
                else if (data == null ^ file == null)
                    throw new Exception("Either both are null or both are set. Data is " + (data == null ? "null." : "set.") + " File is " + (file == null ? "null." : "set.") + " File is " + (file.IsCompleted ? "completed." : "not completed."));
            }
            catch (Exception ex)
            { 
                NetworkComms.LogError(ex, "IncomingPartialFileDataInfo");
            }
        }

 

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        Dictionary<ConnectionInfo, Dictionary<string, ReceivedFile>> receivedFilesDict = new Dictionary<ConnectionInfo, Dictionary<string, ReceivedFile>>();
 
        //临时存放收到的文件字节数据
        Dictionary<ConnectionInfo, Dictionary<long, byte[]>> incomingDataCache = new Dictionary<ConnectionInfo, Dictionary<long, byte[]>>();

       //临时存放收到的文件信息数据
        Dictionary<ConnectionInfo, Dictionary<long, SendInfo>> incomingDataInfoCache = new Dictionary<ConnectionInfo, Dictionary<long, SendInfo>>();

        //收发参数
        SendReceiveOptions customOptions = new SendReceiveOptions<ProtobufSerializer>();

        object syncRoot = new object();

临时存储文件数据用到的字典类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using NetworkCommsDotNet;
using System.ComponentModel;
using System.IO;

namespace AppServer
{
    /// <summary>
    ///接收文件
    /// </summary>
   public  class ReceivedFile 
    {
        /// <summary>
        /// 文件名称
        /// </summary>
        public string Filename { get; private set; }

        /// <summary>
        /// 连接信息列
        /// </summary>
        public ConnectionInfo SourceInfo { get; private set; }

        /// <summary>
        /// 文件大小
        /// </summary>
        public long SizeBytes { get; private set; }

        /// <summary>
        /// 目前为止 已收到的文件代销
        /// </summary>
        public long ReceivedBytes { get; private set; }

        /// <summary>
        /// 完成的百分比
        /// </summary>
        public double CompletedPercent
        {
            get { return (double)ReceivedBytes / SizeBytes; }
            set { throw new Exception("An attempt to modify readonly value."); }
        }

        /// <summary>
        /// 源信息
        /// </summary>
        public string SourceInfoStr
        {
            get { return "[" + SourceInfo.RemoteEndPoint.Address + ":" + SourceInfo.RemoteEndPoint.Port + "]"; }
        }

        /// <summary>
        /// 已经完成
        /// </summary>
        public bool IsCompleted
        {
            get { return ReceivedBytes == SizeBytes; }
        }

        /// <summary>
        /// 同步锁 用来保证线程安全
        /// </summary>
        object SyncRoot = new object();

        /// <summary>
        /// 内存流 用来创建文件
        /// </summary>
        Stream data;

     
        /// <summary>
        /// 创建一个接收文件类
        /// </summary>
        /// <param name="filename">文件名称  Filename associated with this file</param>
        /// <param name="sourceInfo">文件信息类  ConnectionInfo corresponding with the file source</param>
        /// <param name="sizeBytes">文件大小 The total size in bytes of this file</param>
        public ReceivedFile(string filename, ConnectionInfo sourceInfo, long sizeBytes)
        {
            this.Filename = filename;
            this.SourceInfo = sourceInfo;
            this.SizeBytes = sizeBytes;

            //在硬盘上创建一个文件流 使得我们可以接收大文件
            data = new FileStream(filename, FileMode.Create, FileAccess.ReadWrite, FileShare.Read, 8 * 1024, FileOptions.None);
        }

        /// <summary>
        /// 把接收到的字节数据添加到当前文件流种
        /// </summary>
     
        public void AddData(long dataStart, int bufferStart, int bufferLength, byte[] buffer)
        {
            lock (SyncRoot)
            {
                data.Seek(dataStart, SeekOrigin.Begin);
                data.Write(buffer, (int)bufferStart, (int)bufferLength);

                ReceivedBytes += (int)(bufferLength - bufferStart);

                //收到全部数据，保存文件
                if (ReceivedBytes == SizeBytes)
                {
                    data.Flush();
                    data.Close();

                    SaveFileToDisk(@"d:\" + Filename);
                }
            }

           
        }

        /// <summary>
        /// 保存文件
        /// </summary>
        /// <param name="saveLocation">Location to save file</param>
        public void SaveFileToDisk(string saveLocation)
        {
            if (ReceivedBytes != SizeBytes)
                throw new Exception("Attempted to save out file before data is complete.");

            if (!File.Exists(Filename))
                throw new Exception("The transfered file should have been created within the local application directory. Where has it gone?");

            File.Delete(saveLocation);
         
            File.Move(Filename, saveLocation);
        }

        /// <summary>
        ///关闭
        /// </summary>
        public void Close()
        {
            try
            {
                data.Dispose();
            }
            catch (Exception) { }

            try
            {
                data.Close();
            }
            catch (Exception) { }
        }

     
       
    }
}

ReceivedFile方法

3.在MessageContract类库中添加SendInfo契约类方法，此方法用于传递文件信息，客户端和服务器端都需要使用

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using ProtoBuf;

namespace MessageContract
{
    /// <summary>
    /// 文件信息类
    /// </summary>
    [ProtoContract]
 public    class SendInfo
    {
        /// <summary>
        /// 文件名称
        /// </summary>
        [ProtoMember(1)]
        public string Filename { get; private set; }

        /// <summary>
        /// 文件发送-开始位置
        /// </summary>
        [ProtoMember(2)]
        public long BytesStart { get; private set; }

        /// <summary>
        /// 文件大小
        /// </summary>
        [ProtoMember(3)]
        public long TotalBytes { get; private set; }

        /// <summary>
        /// 顺序号
        /// </summary>
        [ProtoMember(4)]
        public long PacketSequenceNumber { get; private set; }

        /// <summary>
        /// 私有构造函数 用来反序列化
        /// </summary>
        private SendInfo() { }

        /// <summary>
        /// 创建一个新的实例
        /// </summary>
        /// <param name="filename">文件名称  Filename corresponding to data</param>
        /// <param name="totalBytes">文件大小  Total bytes of the whole ReceivedFile</param>
        /// <param name="bytesStart">开始位置  The starting point for the associated data</param>
        /// <param name="packetSequenceNumber">顺序号  Packet sequence number corresponding to the associated data</param>
        public SendInfo(string filename, long totalBytes, long bytesStart, long packetSequenceNumber)
        {
            this.Filename = filename;
            this.TotalBytes = totalBytes;
            this.BytesStart = bytesStart;
            this.PacketSequenceNumber = packetSequenceNumber;
        }
    }
}